CN106664147B - Method and apparatus for receiving signal in the wireless access system for supporting FDR transmission - Google Patents
Method and apparatus for receiving signal in the wireless access system for supporting FDR transmission Download PDFInfo
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- CN106664147B CN106664147B CN201480081479.4A CN201480081479A CN106664147B CN 106664147 B CN106664147 B CN 106664147B CN 201480081479 A CN201480081479 A CN 201480081479A CN 106664147 B CN106664147 B CN 106664147B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B15/00—Suppression or limitation of noise or interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
Abstract
The present invention relates to a kind of wireless access systems for supporting full-duplex radio (FDR) transmission environment.According to embodiment of the present invention, a kind of first UE is used to include the following steps in the wireless access system for supporting FDR transmission from the method for base station received signal：The first reference signal is received from the base station；By calculating the first channel information about self-interference using first reference signal；The second reference signal is received from the base station and receives third reference signal from the 2nd UE in the time identical with second reference signal；It is calculated based on second reference signal, the third reference signal and first channel information from the second channel information for wherein eliminating the self-interference；And the signal is received by the third channel information using the second channel information and about the channel for receiving the signal.
Description
Technical field
The present invention relates to the wireless access systems for supporting full-duplex radio (FDR) transmission environment, and more specifically, relate to
And it is a kind of for efficiently sending and receiving the method and a kind of equipment for supporting this method of signal in application FDR.
Background technique
Wireless communication system has been widely used for providing various types of communication services of such as voice or data service.It is logical
Often, wireless communication system be can by share available system resource (bandwidth, transmission (Tx) power etc.) and multiple users into
The multi-address system of row communication.Various multi-address systems are able to use, for example, CDMA (CDMA) system, frequency division multiple access (FDMA)
System, time division multiple acess (TDMA) system, orthogonal frequency division multiple access (OFDMA) system, single-carrier frequency division multiple access (SC-FDMA) system,
Multi-carrier frequency division multiple access (MC-FDMA) system etc..
Summary of the invention
Technical problem
It is an object of the present invention to provide for support FDR transmission wireless access system in efficiently send and
The method for receiving signal.
Another object of the present invention is to provide a kind of equipment for supporting above method.
The technical purpose that can be realized through the invention is not limited to the purpose being particularly described above, and not described herein
Other technical purposes will be more clearly understood that by those skilled in the art from described in detail below.
Technical solution
In order to realize these and other advantage and purpose according to the present invention, as implemented and being broadly described herein
, according to one embodiment, receive by first terminal in the wireless access system for supporting FDR (full-duplex radio) transmission
Include the following steps from the method for base station received signal：The first reference signal is received from the base station；Utilize first base
Calibration signal calculates the first channel information about self-interference；The second reference signal is received from the base station and is receiving described the
Third reference signal is received simultaneously from second terminal when two reference signals；Based on second reference signal, the third benchmark
Signal and first channel information are calculated from the second channel information for wherein eliminating the self-interference；And described in utilizing
Second channel information and third channel information about the channel for receiving the signal above receive the signal.
In order to further realize these and other advantage and purpose according to the present invention, according to different embodiments,
Support FDR (full-duplex radio) wireless access system in from the terminal of base station received signal include RF unit and processing
Device, the processor are configured as receiving the first reference signal from the base station, which is configured as utilizing first base
Calibration signal calculates the first channel information about self-interference, which is configured as receiving the second reference signal from the base station
And third reference signal is received simultaneously from second terminal when receiving second reference signal, which is configured as base
In second reference signal, the third reference signal and first channel information come calculate from wherein eliminate it is described from
The second channel information of interference, the processor be configured as using the second channel information and about above receive described in
The third channel information of the channel of signal receives the signal.
Following items can be usually applied to embodiment according to the present invention.
Second reference signal and the third reference signal can be sent from different frequency resources and time resource.
Second reference signal is sent from a part for the resource for sending CRS (common reference signal) and can be from
Remaining resource sends the third reference signal.
The third reference signal is sent from a part for the resource for sending DM-RS (demodulation reference signal) and can
The third reference signal is sent from remaining resource.
Second reference signal and the third reference signal can be assigned to radio resource so that described
Two channel informations have the value close to first channel information.
Second reference signal and the third reference signal can be assigned to radio resource so that described
Two channel informations have the value close to the third channel information.
The method can also include the following steps：Receive UE capabilities request message；And sending includes indicating the FDR
The UE capability information message for the field whether transmission is supported.
Above-mentioned general description of the invention and it is described in detail below be exemplary and illustrative, and be intended to provide to such as
The further explanation of claimed invention.
Beneficial effect
Embodiment according to the present invention can obtain following effect.
Firstly, signal can be efficiently sent and be received in the wireless access system for supporting FDR transmission.
Effect according to the present invention is not limited to the effect being particularly described above, and further advantage not described herein
It described in detail below will be more clearly understood that by those skilled in the art from of the invention.That is, of the invention is unplanned
In effect can also be obtained by those skilled in the art from embodiments of the present invention.
Detailed description of the invention
Fig. 1 instantiates the network structure of the E-UMTS as example wireless communications.
Fig. 2 instantiates the radio interface protocol frame between UE and E-UTRAN based on 3GPP radio access network standard
The control plane and user plane of structure.
Fig. 3 instantiates physical channel used in 3GPP system and the general signal transmission side using these physical channels
Method.
Fig. 4 instantiates the structure of radio frame used in LTE system.
Fig. 5 instantiates the structure of downlink radio frame used in LTE system.
Fig. 6 instantiates the structure of uplink subframe used in LTE system.
Fig. 7 instantiates the configuration of general MIMO communication system.
Fig. 8 and Fig. 9 instantiates the periodic report of channel state information.
Figure 10 instantiates the exemplary interference situation in FDR scheme.
The exemplary aggressor signals that Figure 11 instantiates when the power of the power ratio desired signal of interference signal is much higher disappear
It removes.
The example for the case where power that Figure 12 instantiates interference signal is lower than the power of desired signal.
Figure 13 instantiates the base band after the ADC according to the size for having used the self-interference kept after simulation removing method
The example of signal.
Figure 14 is the stream for restoring the process of preferred signals using the channel information obtained by conventional channel estimation scheme
Cheng Tu.
Figure 15 instantiates the example for sending and receiving terminal and signal in FDR system.
Figure 16 is the exemplary flow chart of the method according to the present invention for receiving signal.
Figure 17 instantiates traditional CRS and reference signal according to the present invention.
Figure 18 instantiates traditional DM-RS and reference signal according to the present invention.
Figure 19 instantiates the base station for being suitable for the invention an embodiment and user equipment.
Specific embodiment
Following implementation is proposed by combining composition component and characteristic of the invention according to predetermined format.It is not depositing
Under conditions of Additional Remarks, individually forms component or characteristic is considered as optional factor.If desired, individual group
It can not be with other components or property combination at component or characteristic.And it is possible to combine some composition components and/or characteristic with reality
Existing embodiments of the present invention.It can will the disclosed order modification operated be in embodiments of the present invention another time
Sequence.The some components or characteristic of any embodiment can also be included in other embodiment, or can be used when necessary
Those of other embodiment component or characteristic replace.
Embodiments of the present invention are disclosed based on the data communications context between base station (BS) and terminal.In such case
Under, BS is used as the terminal node for the network that BS can be used to directly be communicated with terminal.It when necessary will be by BS in the present invention
The specific operation of progress can also be carried out by the upper layer node of BS.
In other words, to those skilled in the art it will be obvious that, for enabling BS by including BS
The various operations communicated in the network of several network node compositions with terminal will be by BS or other networks in addition to the BS
Node carries out.Term " BS " can use fixed station, node B, evolved node B (eNB or eNode B) or access point when necessary
(AP) it replaces.Term " relay " can be replaced with relay node (RN) or relay station (RS).Term " terminal " is gone back when necessary
It can be replaced with user equipment (UE), movement station (MS), mobile subscriber station (MSS) or subscriber station (SS).
It should be noted that disclosed in this invention specific term be to be best understood from for convenience of description and to of the invention
And propose, and the purposes of these specific terms can be changed into another lattice in technical scope or spirit of the invention
Formula.
In some cases, known features and device are omitted so as to avoid making design of the invention from obscuring, and with frame
Diagram form shows the critical function of construction and device.Identical appended drawing reference will be used to refer in all the appended drawings same or like
Part.
Embodiments of the present invention pass through for including institute of Electrical and Electronic Engineers (IEEE) 802 system, the third generation
In the wireless access system of partner program (3GPP) system, 3GPP long term evolution (LTE) system and 3GPP2 system at least
Normative document disclosed in one is supported.Particularly, it is not described in embodiments of the present invention to clearly reveal this
The step of technical idea of invention or part can be supported by document above.All terms used herein can pass through
At least one of above-mentioned document is supported.
Following implementation of the invention can be applied to various wireless access technologys, such as CDMA (CDMA),
Frequency division multiple access (FDMA), time division multiple acess (TDMA), orthogonal frequency division multiple access (OFDMA), single-carrier frequency division multiple access (SC-FDMA) etc..
CDMA can access wireless (or radio) technology of (UTRA) or CDMA 2000 with such as universal terrestrial radio come specific real
It is existing.TDMA can use such as global system for mobile communications (GSM)/General Packet Radio Service (GPRS)/enhancing data rate
Wireless (or radio) technology of GSM evolution (EDGE) implements.OFDMA can use such as electrics and electronics engineering Shi Xue
Meeting (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20 and evolved UTRA (E-UTRA) nothing
Line (or radio) technology implements.UTRA is a part of Universal Mobile Telecommunications System (UMTS).Third generation cooperation partner
With a part that plan long term evolution (3GPP LTE) is using the evolved UMTS (E-UMTS) of E-UTRA.3GPP LTE is under
Using OFDMA and in the uplink using SC-FDMA in line link.LTE-Advanced (LTE-A) is 3GPP LTE
Evolution.WiMAX can be by IEEE802.16e (wirelessMAN-OFDMA baseline system) and advanced IEEE 802.16m
(wirelessMAN-OFDMA advanced system) illustrates.3GPP LTE and lte-a system are concentrated on for clarity, being described below.
However, technical characteristic of the invention is without being limited thereto.
The structure of downlink radio frame will be described referring to Fig.1.
In cellular orthogonal frequency division multiplexing (OFDM) packet radio communication system, uplink/downlink data point
Group is sent in subframe.One subframe is defined to include the predetermined time interval of multiple OFDM symbols.3GPP LTE standard branch
It holds the Class1 radio frame structure suitable for frequency division duplex (FDD) and is suitable for 2 radio of type of time division duplex (TDD)
Frame structure.
Fig. 1 is to instantiate the figure of the structure of Class1 radio frame.Downlink radio frame includes 10 subframes, and
One subframe includes two time slots in the time domain.Sending the time required for a subframe is defined as transmission time interval
(TTI).For example, a subframe can have the length of 1ms and a time slot can have the length of 0.5ms.One time slot
It can in the time domain include multiple OFDM symbols and in a frequency domain include multiple resource blocks (RB).Because 3GPP LTE system exists
OFDMA is used in downlink, so OFDM symbol indicates a symbol duration.OFDM symbol can be referred to as SC-
FDMA symbol or symbol duration.RB is the resource allocation unit in one time slot including multiple continuous subcarriers.
It can be according to the quantity for the OFDM symbol for including in one time slot of configuration change of cyclic prefix (CP).There are extensions
CP and normal CP.For example, the quantity for the OFDM symbol for including in next time slot the normal CP the case where can be seven.It is extending
In the case where CP, the quantity for the OFDM symbol that the length of an OFDM symbol increases and therefore includes in a time slot is less than
The quantity of OFDM symbol in the case where normal CP.In the case where extending CP, the number for the OFDM symbol for including in a time slot
Amount can be six.If unstable the case where channel status is as when UE is fast moved, can be used extension CP so as to
Further decrease the interference between symbol.
In the case where normal CP, because a time slot includes seven OFDM symbols, then a subframe includes 14 OFDM
Symbol.The first two of each subframe or three OFDM symbols can be assigned to physical downlink control channel (PDCCH) simultaneously
And remaining OFDM symbol can be assigned to physical down link sharing channel (PDSCH).
The structure of radio frame is merely exemplary.Therefore, it can change in various ways in a radio frame and include
The quantity for the symbol for including in the quantity for the time slot for including in the quantity of subframe, a subframe or a time slot.
Fig. 2 is to instantiate the exemplary figure of the resource grid in a downlink time slots.OFDM symbol passes through normal CP
To configure.Referring to Fig. 2, downlink time slots include multiple OFDM symbols and in a frequency domain include multiple RB in the time domain.To the greatest extent
Pipe Fig. 2 illustratively depicts a downlink time slots including seven OFDM symbols and a RB includes 12 subcarriers,
However the invention is not limited thereto.Each element of resource grid is referred to as resource element (RE).For example, RE a (k, l) is located at kth
At a subcarrier and the 1st OFDM symbol.In the case where normal CP, a RB includes the case where 12 × 7 RE (in extension CP
Under, a RB includes 12 × 6 RE).Because the spacing between subcarrier is 15kHz, a RB is about in a frequency domain
180kHz。NDLIndicate the quantity for the RB for including in downlink time slots.NDLIt is based upon the downlink chain of node B scheduling setting
Road transmission bandwidth and determination.
Fig. 3 is to instantiate the figure of the structure of downlink subframe.Most the three of the first time slot beginning of a subframe
A OFDM symbol corresponds to the control area for being assigned control channel.Remaining OFDM symbol, which corresponds to, to be assigned under physics
The data area of ink Shared Channel (PDSCH).BTU Basic Transmission Unit is a subframe.That is, PDCCH and PDSCH
It is assigned across two time slots.The example of downlink control channel used in 3GPP LTE system includes such as physical control
Format indicator channel (PCFICH), physical downlink control channel (PDCCH), physical mixed automatic repeat request indicator
Channel (PHICH) etc..PCFICH is located in the first OFDM symbol of subframe, carries about for the control channel in subframe
The information of the quantity of OFDM symbol.PHICH includes the HARQ acknowledgement/non-acknowledgement as the response transmitted to uplink
(ACK/NACK) signal.The control information sent on PDCCH is referred to as down link control information (DCI).DCI includes uplink
Link or downlink schedule information or uplink transmission power control command for particular UE group.PDCCH can wrap
Include information, the uplink shared channel (UL- of the resource allocation and transformat about downlink sharied signal channel (DL-SCH)
SCH the paging information of resource allocation information, paging channel (PCH)), about the system information of DL-SCH, about such as existing
The information of the resource allocation of the high-layer control message of the random access response (RAR) emitted on PDSCH, in particular UE group
One group of transmission power control command of individual UE, send power control information, about voice-over-IP telephone (VoIP) activation letter
Breath etc..Multiple PDCCH can be sent in control area.UE can monitor multiple PDCCH.PDCCH is one or several continuous
Control channel element (CCE) polymerization on send.CCE is for the code rate offer with the state based on radio channel
The logical allocation unit of PDCCH.CCE includes one group of RE.It is based on CCE for the format of PDCCH and the quantity of available bits
Correlation between quantity and the code rate provided by CCE and determination.BS is determined according to the DCI of UE to be sent to
PDCCH format, and cyclic redundancy check (CRC) is attached to control information.CRC is logical according to the owner of PDCCH or usage
It crosses radio network temporary identifier (RNTI) and carries out mask processing.If PDCCH is used for particular UE, CRC can pass through UE
Cell-RNTI (C-RNTI) carry out mask processing.If PDCCH is used for paging message, CRC can pass through Paging Indicator
Identifier (P-RNTI) carries out mask processing.If PDCCH is used for system information (more specifically, system information block (SIB)),
CRC can carry out mask processing by system information identifier and system information RNTI (SI-RNTI).In order to indicate to connect to from UE
The random access response of the random access lead code of receipts, CRC can be carried out at mask by random access-RNTI (RA-RNTI)
Reason.
Fig. 4 is to instantiate the figure of the structure of uplink subframe.In a frequency domain, uplink subframe can be divided into control
Region and data area processed.Physical uplink control channel (PUCCH) including uplink control information is assigned to control
Region processed.Physical uplink shared channel (PUSCH) including user data is assigned to data area.In order to maintain single load
Wave property, a UE do not send PUCCH and PUSCH simultaneously.PUCCH for a UE is assigned to RB pairs in subframe.RB
Pair RB occupy the different sub-carrier in two time slots.Therefore, the RB of PUCCH is distributed to frequency hopping on the slot boundary.
The modeling of multiple-input and multiple-output (MIMO) system
Mimo system improves data transmission/reception efficiency using multiple Tx antennas and multiple Rx antennas.MIMO be by from
The received data sectional of mutiple antennas is placed into the application in entire message, entirely disappears without being received according to individual antenna path
Breath.
MIMO scheme is classified as space diversity and spatial reuse.It is reliable that space diversity improves transmission using diversity gain
Property or radius of society, and therefore be suitable for for quickly movement UE data transmission.In spatial reuse, multiple Tx antennas are same
When send different data, and high-speed data therefore can be sent in the case where not increasing system bandwidth.
Fig. 5 instantiates the configuration for supporting the wireless communication system of mutiple antennas.Referring to Fig. 5 (a), when transmission (Tx) antenna
Quantity and the quantity for receiving (Rx) antenna increase to N at both transmitters and receivers place respectivelyTAnd NRWhen, and in transmitter
It is compared at the only one in receiver using mutiple antennas, the quantity of paper channel transmission capacity and antenna proportionally increases
Add.Therefore, transmission rate and frequency efficiency significantly increase.Together with the increase of channel transfer capability, will may theoretically it pass
Defeated rate is improved to the product of the maximum transfer rate Ro and rate increment rate Ri that can realize in the case where individual antenna.
[formula 1]
Ri=min (NT, NR)
For example, there are four the MIMO communication systems of Tx antenna and four Rx antennas for tool relative to single-antenna wireless communication system
System can theoretically realize four times of increases in transmission rate.Because the theoretical capacity of mimo wireless communication system increases in 20 generation
Record the nineties be proved to, so always energetically study many technologies in a manner of in actual implementation in increase data rate.This
Some in a little technologies have been reflected in including the standard for 3G mobile communication, generation WLAN in future (WLAN) etc.
Various wireless communication standards in.
Up to the present about the research tendency of MIMO, many aspects of the positive research in MIMO are underway, including
To with the research of the related information theory of calculating of multi-antenna communication capacity in diversity channel environment and multiple access environments, to measurement
The research of MIMO radio channel and MIMO modeling, space-time signal processing technique for improving transmission reliability and transmission rate
Research etc..
It will be described in detail by digital modeling with NTA Tx antenna and NRCommunication in the mimo system of a Rx antenna.
About signal is sent, N can be passed throughTA Tx antenna sends most NTInformation, is such as expressed as following vector.
[formula 2]
It can be to every transmission informationUsing different transmission power.Allow send information transmission power
It is horizontal respectively byIt indicates.It is then possible to which the transmission information vector for providing transmission power control is
[formula 3]
Send the transmission information vector of power controlCan use send power diagonal matrix P be expressed it is as follows.
[formula 4]
It can be by the way that the information vector of power control will be sentN is generated multiplied by weight matrix WTA transmission signalWeight matrix W is used to suitably be distributed to Tx antenna for information is sent according to state of transmission channel etc..This NT
A transmission signalIt is represented as vector x, can be determined that
[formula 5]
Here, wijIndicate that weight and W between j-th strip information and i-th of Tx antenna are pre-coding matrixes.
It can use and be treated differently transmitted signal x according to two schemes (for example, space diversity and spatial reuse).
In spatial reuse, different signals is re-used and is sent to receiver, so that the element of information vector has different values.?
In space diversity, identical signal is transmitted repeatedly by multiple channel paths, so that the element of information vector is with identical
Value.Spatial multiplexing and spatial diversity can be used in conjunction with.For example, can in space diversity by three Tx antennas come
Identical signal is sent, however receiver can be sent by remaining signal in spatial reuse.
Consider NRA Rx antenna, the received signal at Rx antennaIt can be represented as following vector.
[formula 6]
When being modeled in mimo wireless communication system to channel, can according to the index of Tx antenna and Rx antenna come
Distinguish them.Channel between j-th of Tx antenna and i-th of Rx antenna is indicated by hij.Notably, Rx days in hij
The index of line is before the index of Tx antenna.
Fig. 5 (b) is instantiated from NTChannel of a Tx antenna to i-th of Rx antenna.These channels can be collectively represented
For vector or matrix.Referring to Fig. 5 (b), from NTThe channel of a Tx antenna to i-th of Rx antenna can be expressed as
[formula 7]
Therefore, from NTA Tx antenna is to NRAll channels of a Rx antenna can be expressed as following matrix.
[formula 8]
Actual channel undergoes the above channel matrix H, has then been added additive white Gaussian noise (AWGN).It is added to NRIt is a
The AWGN of Rx antenna is presented as following vector.
[formula 9]
According to the above mathematical modeling, received signal vector is given
[formula 10]
The quantity for indicating the row and column in the channel matrix H of channel status is determined according to the quantity of Rx antenna and Tx antenna
's.Specifically, the quantity of the row in channel matrix H is equal to the quantity N of Rx antennaR, the quantity of the column in channel matrix H is equal to Tx
The quantity N of antennaT.Therefore, channel matrix H has NR×NTSize.
The smaller that rank of matrix is defined as the quantity of the independent rows in matrix between the quantity that independently arranges.Therefore,
Quantity of the rank of matrix no more than the row or column of matrix.The order rank (H) of channel matrix H meets following constraint.
[formula 11]
rank(H)≤min(NT,NR)
In MIMO transmission, term " order " indicates the quantity in the path for independently sending signal, and term " layer
Number " indicates the quantity of the signal stream sent by respective paths.In general, because transmitter sends and for signal transmission
The layer of the quantity of order as many, so unless otherwise noted, otherwise order has meaning identical with the number of plies.
Reference signal (RS)
In a wireless communication system, grouping is sent over a radio channel.In view of the property of radio channel, grouping may
It is distorted during transmission.In order to be successfully received signal, receiver should utilize mistake of the channel information to received signal
Really compensate.Generally, in order to enable receiver can obtain channel information, it is transmitters and receivers two that transmitter, which is sent,
Signal known to person, and receiver obtains knowing for channel information based on the distortion of received signal over a radio channel
Know.This signal is referred to as pilot signal or RS.
Through the data transmission and reception of mutiple antennas, channel status between Tx antenna and Rx antenna
Knowledge is required for successful signal receives.Therefore, each Tx antenna should have a RS.
In mobile communication system, the purpose that RS is serviced according to them is two types by classification：Believe for channel
The RS of the acquisition of breath and RS for data demodulation.The RS of former type should be sent in broadband so that UE can be obtained
Downlink channel information.Even do not received in specific sub-frame down link data UE should be able to receive these RS and
Measure them.When eNB sends down link data, it sends latter type's in the resource for distributing to down link data
RS.UE can be executed channel estimation by receiving RS and therefore be demodulated based on channel estimation to data.It should be in number
According to sending these RS in transmission region.
In traditional 3GPP LTE system (for example, the system for meeting 3GPP LTE version 8), two kinds of downlink
RS is defined for unicast services, public RS (CRS) and dedicated RS (DRS).CRS is used for CSI and obtains and measure, for example, with
In switching.CRS is also called the specific RS of cell.DRS is used for data demodulation, is referred to as the specific RS of UE.Traditional 3GPP LTE system
DRS is only used for data demodulation and CRS is used for two purposes of channel information acquisition and data demodulation by system.
Broadband is crossed in each subframe as the specific CRS of cell to be sent.According to the number of the Tx antenna at eNB
Amount, eNB can send CRS for up to four antenna ports.For example, there are two the eNB of Tx antenna to be directed to 0 He of antenna port for tool
Antenna port 1 sends CRS.If there are four Tx antennas for eNB tool, it is directed to corresponding four Tx antenna ports (antenna port 0
To antenna port 3) send CRS.
Fig. 6 instantiate in the system in eNB tool there are four Tx antenna for RB (when in the case where normal CP being to include
Between on 14 OFDM symbols multiply 12 subcarriers in frequency) CRS and DRS pattern.In Fig. 6, be marked with ' R0 ',
The RE of ' R1 ', ' R2 ' and ' R3 ' respectively indicate the position of the CRS for antenna port 0 to antenna port 4.It is marked with the RE of ' D '
Indicate the position of DRS defined in LTE system.
Lte-a system (evolution of LTE system) can support up to eight Tx antennas.Therefore, it should also support to be used for
The RS of up to eight Tx antennas.Because being only that up to four Tx antennas define downlink RS in LTE system, work as
When eNB tool is there are five to eight downlink Tx antennas in lte-a system, it should additionally for five to eight Tx antenna ports
Define RS.The RS and RS for data demodulation bis- for channel measurement should be considered for up to eight Tx antenna ports
Person.
For the design of lte-a system important consideration item first is that backwards compatibility.Backwards compatibility is to guarantee to pass
The feature that system LTE terminal even also normally operates in lte-a system.If being directed to the RS quilt of up to eight Tx antenna ports
It is added to the T/F region for sending the CRS defined by LTE standard across total frequency band in each subframe, then RS expense becomes
It obtains huge.Therefore, it should new RS is designed for up to eight antenna ports, so that RS expense reduces.
Substantially, two kinds of new RS is introduced in lte-a system.One seed type be for be used for transmission order, modulation with
The CSI-RS of the purpose service of the channel measurement of the selection of encoding scheme (MCS), pre-coding matrix index (PMI) etc..It is another kind of
Type is the demodulation RS (DM RS) of the demodulation of the data for being sent by up to eight Tx antennas.
With two mesh of the measurement and data demodulation that are used for such as channel measurement and handover measurement in traditional LTE system
CRS compare, CSI-RS predominantly channel estimation and design, but it may be utilized for handover measurement.Because only
For the acquisition of channel information purpose and send CSI-RS, it is possible that them are not sent in each subframe, with traditional LTE
CRS in system is different.Therefore, CSI-RS may be configured so that and intermittently (for example, periodically) be sent out along the time axis
It send, for reducing CSI-RS expense.
When sending data in downlink subframe, DM technically also is sent to the UE that data transmission is scheduled targeted
RS.It therefore, can be with design specialized in the DM RS of particular UE, so that they are only in the resource area dispatched for particular UE
(that is, only in the T/F region for carrying data for particular UE) sends.
Fig. 7 instantiates the exemplary DM RS pattern defined for lte-a system.In Fig. 7, the RE of carrying DM RS is being carried
The RB of down link data (multiplies 12 sons in frequency with temporal 14 OFDM symbols in the case where normal CP
The RB of carrier wave) in position handled by mask.It can be in lte-a system for the four antenna port (days additionally defined
Line end mouth 7 is to antenna port 10) send DM RS.It can be by their different frequencies for the DM RS of different antennae port
Resource (subcarrier) and/or different time resource (OFDM symbol) identify.This means that can be according to frequency division multiplexing (FDM)
And/or time division multiplexing (TDM) is multiplexed DM RS.If the DM RS for different antennae port is arranged on identical
In m- frequency resource, then they can be identified by their different orthogonal codes.That is, can be multiple according to code point
These DM RS are multiplexed with (CDM).Illustrated by the case where Fig. 7, for the DM of antenna port 7 and antenna port 8
RS can be located on the RE of DM RS CDM group 1 by the multiplexing based on orthogonal code.Similarly, for antenna port 9 and antenna end
The DM RS of mouth 10 can pass through the multiplexing based on orthogonal code and be located on the RE of DM RS CDM group 2.
Fig. 8 instantiates the exemplary CSI-RS pattern defined for lte-a system.In fig. 8, the RE for carrying CSI-RS is being held
The RB for carrying down link data (multiplies 12 in frequency with temporal 14 OFDM symbols in the case where normal CP
The RB of subcarrier) in position handled by mask.One in CSI-RS pattern illustrated by Fig. 8 (a) to 8 (e) can be used for appointing
What downlink subframe.It can be for eight antenna ports (antenna port 15 to antenna port 22) supported by lte-a system
Send CSI-RS.For different antennae port CSI-RS can by they different frequency resources (subcarrier) and/or
Different time resource (OFDM symbol) identifies.This means that can be multiplexed according to FDM and/or TDM to CSI-RS.If
The CSI-RS set in the identical time-frequency resources for different antennae port can be by their different orthogonal codes
To identify.That is, can be multiplexed according to CDM to these DM RS.Illustrated by the case where Fig. 8 (a), for
The CSI-RS of antenna port 15 and antenna port 16 can be located at the RE of CSI-RS CDM group 1 by the multiplexing based on orthogonal code
On.CSI-RS CDM group can be located at by the multiplexing based on orthogonal code for the CSI-RS of antenna port 17 and antenna port 18
On 2 RE.CSI-RS can be located at by the multiplexing based on orthogonal code for the CSI-RS of antenna port 19 and antenna port 20
On the RE of CDM group 3.It can be located at by the multiplexing based on orthogonal code for the CSI-RS of antenna port 21 and antenna port 22
On the RE of CSI-RS CDM group 4.The same principle referring to described in Fig. 8 (a) is suitable for illustrated by Fig. 8 (b) to Fig. 8 (e)
CSI-RS pattern.
Fig. 9 is to instantiate the figure of exemplary zero power (ZP) CSI-RS pattern defined in lte-a system.ZP CSI-RS
It is mainly used in two purposes.Firstly, ZP CSI-RS is for improving CSI-RS performance.That is, a network can inhibit
The CSI-RS RE of another network is to improve the CSI-RS measurement performance of another network and by the way that inhibited RE to be set as
ZP CSI-RS notifies inhibited RE to its UE, allows UE that rate-matched is appropriately carried out.Second, ZP CSI-RS quilt
Interference measurement for being calculated for CoMP CQI.That is, some networks can inhibit ZP CRS-RS RE and UE can
To calculate CoMP CQI by interference of the measurement from ZP CSI-RS.
The RS pattern of Fig. 6 to Fig. 9 is purely exemplary, and is applied to the RS pattern of various embodiments of the invention
It is not limited to these specific RS patterns.In other words, even if when defining and using the RS pattern different from the RS pattern of Fig. 6 to Fig. 9
When, various embodiments of the invention can also be applied in the same manner.
Full-duplex radio (FDR) transmission
FDR refers to eNB and/or UE it is not necessary that uplink/downlink duplex is executed separately on frequency/time
In the case of support transmission send and receive technology etc..
Figure 10 is to instantiate the figure of the exemplary interference situation in FDR scheme.
0, UE 1 and UE 2 is executed on uplink/downlink logical using identical frequency/time resource referring to Fig.1
Letter.Therefore, each UE can execute transmission and at the same time receiving signal from another eNB or UE.That is, such as the dotted line of Figure 10
Illustrated by, the transmission signal of device is received by the receiving module (or receiver) of device to directly result in the communication loop of self-interference
Border is formed.
When considering multiple cell deployed environment in systems, due to FDR introducing and expected new interference or increased dry
It disturbs and is summarized as follows.
(1) self-interference (self-interference in device)
(2) multi-user interference (being interfered between UE to UE link)
(3) inter-cell interference (being interfered between BS to BS link)
The signal that self-interference instruction is sent from device directly results in interference for the receiver of device as illustrated.It is logical
Often, self-interference signal is by with the power reception higher than desired signal.It is therefore important that preferably being disappeared by interference cancellation operation
Except self-interference.
Second, multi-user interference refers to the interference occurred between UE.For example, multi-user interference indicates the letter sent by UE
Number by adjacent position UE receive, thus as interference.In legacy communications system, because individually being held in frequency domain or on the time
The semiduplex mode (for example, FDD or TDD) of row uplink or downlink transmission is implemented, so in uplink under
It is not interfered between line link.However, uplink and downlink share the FDR transmission of identical frequency/time resource
Environment causes interference between the eNB for sending data and as illustrated in Figure 10 adjacent UE.
Finally, inter-cell interference indicates the interference occurred between eNB.For example, inter-cell interference instruction is existed by an eNB
The signal sent under isomery eNB situation is received by the receiving antenna of another eNB, thus as interference.This interference is indicated and is mostly used
It interferes identical communication scenario and is occurred and sharing uplink and down-chain resource between eNB in family.Namely
It says, although FDR can improve frequency effect by sharing identical time/frequency resource in uplink and downlink
Rate, however increased interference may limit frequency efficiency improvement.
In the interference of three of the above type, (1) should be first against the influence of the interference due to only occurring in FDR
Caused by FDR operation solve self-interference.Figure 10 shows the exemplary FDR under self-interference situation.In more detail, by a UE
The signal of transmission is received by the receiving antenna of same UE, thus as interference.
This self-interference has the unique trait opposite with other interference.
Firstly, the signal for serving as interference is considered the signal preferably known.
Second, the power for serving as the signal of interference is significantly higher than the power of desired signal.Therefore, even if serving as interference
Signal is preferably known that receiver can not preferably eliminate interference.Receiver will be connect using analog-digital converter (ADC)
The signal received is converted into digital signal.In general, the power for the signal that ADC measurement receives is to adjust received signal
Power level quantifies the power-adjusted signal received, and quantified signal is converted into digital signal.
However, the characteristic of desired signal is quantized if interference signal relative to the significantly higher power of desired signal by receive
The quantization level of period covers and therefore received signal may be resumed.Figure 11 is instantiated even when interference
The desired signal after the elimination of the interference signal during quantifying is executed when the power of the power ratio desired signal of signal is much higher
Distortion figure, Figure 12 be instantiate when the power of interference signal be lower than desired signal power when eliminate interference signal it
The figure of the recovery of desired signal afterwards.
As that can see from Figure 11 and Figure 12, when self-interference is suitably eliminated, expectation can be received well
Signal.
Figure 13 instantiates the base after the ADC according to the size of the self-interference kept after using simulation removing method
The example of band signal.Specifically, Figure 13, which is instantiated, is connect in the signal sent by sending device 1 and sending device 2 by sending device 1
It receives and analog end interferes the baseband signal eliminated after being performed with ADC.Referring to Fig.1 3 (a), it is being simulated because interference is eliminated
End is not executed fully, so the signal sent by sending device 1 and sending device 2 is overlapped in low 3 bits.Referring to figure
13 (b), it is fully executed because interference is eliminated, low 8 bits are overlapping.The resolution of overlapping bit indication preferred signals
Rate.
In Figure 13, the most left bit of baseband signal corresponds to MSB (most significant bit) and normal MSB corresponds to symbol
Bit.
FDR and reference signal
In a wireless communication system, it is distorted in symbol size and phase due to multipath attenuation.In order to the mistake
Really is estimated and compensated, it is main to use the channel estimation scheme for utilizing reference signal.In this case, reference signal can
It is only sent in single resource (time or frequency) by single terminal, rather than is sent simultaneously by multiple transmission terminals.
For example, when sending device 1 is intended to receive signal from sending device 2, sending device 1 does not execute hair in Figure 13
It send, however only sending device 2 sends reference signal.If having used the system (HDR) without using traditional FDR in FDR system
Used in reference signal and the method that sends the reference signal, then problem may occur.
Channel estimation is executed using the signal arranged between sending device and reception device.It include about channel matter
The previously arranged signal of the information of amount is referred to as reference signal.If receiving signal, channel information and sending signal and correspond respectively to r, H
And x, then it can satisfy equation discussed below.
R=Hx
Receiver can be utilized as reference signal x known to transmitting terminal and receiving end the two based on reception signal r to obtain
Channel information H.If frame does not include reference signal, it can calculate transmission signal using channel information H and reception signal r
x。
Figure 14 is the stream for restoring the process of preferred signals using the channel information obtained by conventional channel estimation scheme
Cheng Tu.
Referring to Fig.1 4, in step S1401, receive the signal sent by base station or different terminals.Then, simulation is utilized
Scheme executes interference at antenna end and eliminates [S1403].RF signal is converted into baseband signal [S1403] and believes the base band
Number execute ADC [S1405].Then, digital interference is executed using the channel information Hsi about self-interference eliminate [S1407].With
Afterwards, it is extracted using the channel information Hd about preferred signals and restores preferred signals [S1409, S1411].
Particularly, it if using conventional channel estimation scheme in FDR system, can calculate separately about self-interference
Channel information Hsi and channel information Hd about preferred signals.Then, preferred signals can be obtained using channel information Hd.
In this case, it because the size of self-interference signal is significantly more than the size of preferred signals, is calculating
Significant problem will not occur during Hsi.However, as shown in figure 13, if receiving preferred signals and self-interference simultaneously,
The size that the preferred signals of quantized signal are then occupied after ADC can become smaller.
As mentioned in foregoing description, because conventional channel estimation method cannot reflect due to the certainly dry of preferred signals
Quantization error caused by disturbing, it is therefore necessary to have the reference signal for considering self-interference and ADC and send the reference signal
Method.
The method according to the present invention for sending reference signal
The invention proposes send in the FDR system there are self-interference for passing through digital interference after ADC
The method for the reference signal that the baseband signal of elimination is estimated.Specifically, according to the present invention, additional reference signal is sent
To execute the channel estimation in view of self-interference and ADC.
Figure 15 instantiates the example for sending and receiving terminal and signal in FDR system.
Referring to Fig.1 5, it receives terminal and sends the terminals of preferred signals and be respectively configured as device 1 and device 2.Device 1 from
Device 2 receives preferred signals x, and receives the self-interference for carrying out the signal y that free device 1 is sent itself.Hereinafter, such as Figure 15
It is shown, illustrate that device 1 receives preferred signals from device 2 and receives showing for the self-interference for the signal that next free device 1 is sent
Example, the present invention may be without being limited thereto.Characteristic of the invention is not limited by aforesaid environmental and can be applied to various FDR systems
System.
Figure 16 is the exemplary flow chart of the method according to the present invention for receiving signal.
Firstly, defining the prerequisite and signal for executing the method according to the present invention for receiving signal.
Channel for preferred signals is defined by the channel between the number elimination of the transmission antenna and device 1 of device 2,
And the channel is specified by Heff.
Hsi and Hd is to be calculated in the case of reference signal is not sent simultaneously using the method referred to previously in Figure 14
's.
In order to obtain Heff, part reference signal is sent by device 1 and device 2 simultaneously.
It is assumed that the channel circumstance of device 1 is in very slowly change and self-interference signal is considerably stronger than preferred signals.Cause
This, can using and meanwhile the reference signal and Hsi that send eliminate the self-interference channel information about device 1.
Referring to Fig.1 6, firstly, device eliminates the interference [S1601] at analog end and generates baseband signal [S1603].It is right
Baseband signal, which executes ADC [S1605] and executes number using Hsi, eliminates [S1607].After number elimination is performed, no
Whether pipe self-interference is included all calculating Heff using the preferred signals of extraction and by the reference signal of the transmission simultaneously of device 2
[S1609]。
Although not completely eliminating self-interference signal during number is eliminated, because can utilize by device 2 simultaneously
The reference signal of transmission knows Heff and Hd, so can extract and restore preferred signals [S1611, S1613].
Specifically, when extracting preferred signals after number is eliminated, tradition Hd can not be used only and use Heff
Come quantization error caused by reflecting due to the self-interference to preferred signals.
Reference signal according to the present invention
In order to not made a change to transport overhead compared with legacy system, a part of traditional benchmark signal can be used as
The reference signal to send simultaneously.Also, it as the method for enhancing performance while increasing transport overhead, can redefine
The reference signal and traditional benchmark signal to send simultaneously.Hereinafter, reference signal according to the present invention using CRS and
DM-RS is illustrated as the representative basis signal in LTE.However, reference signal according to the present invention is not limited by CRS and DM-RS
System.If a part of traditional benchmark signal is used as the reference signal to send simultaneously, any reference signal can be arranged.
Figure 17 instantiates traditional CRS and reference signal according to the present invention.
Referring to Fig.1 7, a part of traditional CRS reference signal can be used as the reference signal to send simultaneously.Especially
Ground, if the reason of traditional benchmark signal is used, it may have the advantage that is that transport overhead does not increase.Figure 17 (a) example
Traditional CRS in the case where 2 antenna ports is shown.
The reference signal sent while Figure 17 (b) is instantiated according to the present invention and the reference signal quilt not sent simultaneously
It is configured to be positioned as close to the example of frequency axis and time shaft.In such a situation it is preferred to which Heff is made to become to believe with Hsi and Hd
It ceases as similar as possible.Also, reference signal according to the present invention is not limited by the structure of reference signal shown in Figure 17 (b).Such as
A part of fruit reference signal is used as the reference signal to send simultaneously, then it can be applied to various traditional benchmark letters
Number.
Figure 18 instantiates traditional DM-RS and reference signal according to the present invention.
Similar to the CRS referred to previously in Figure 17, a part of DM-RS corresponding with traditional benchmark signal also can by with
Make the reference signal to send simultaneously.Figure 18 (a) instantiates the example of traditional DM-RS in the case where 2 antenna ports.
The reference signal that is sent while Figure 18 (b) is instantiated according to the present invention and without and meanwhile the reference signal that sends
It is configured as being positioned as close to the example of frequency axis and time shaft.In this case it is preferable to make Heff become with Hsi and
Hd information is as similar as possible.
Also, reference signal according to the present invention is not limited by the structure of reference signal shown in Figure 18 (b).If benchmark
A part of signal is used as the reference signal to send simultaneously, then it can be applied to various traditional benchmark signals.
Figure 19 instantiates the base station for being suitable for the invention an embodiment and user equipment.
If relay is included in wireless communication system, in backhaul link between base station and relay
It executes and communicates and communicated being executed between relay and user equipment in access link.Therefore, base station shown in the drawings
It can be replaced according to situation with relay with user equipment.
Referring to Fig.1 9, wireless communication system includes base station 1910 and user equipment 1920.Base station 1910 includes receiving module
1911, sending module 1912, processor 1913, memory 1914 and radio frequency (RF) unit 1915.Processor 1913 can be matched
Realization is set to by process proposed by the present invention and/or method.Memory 1914 connect with processor 1913 and stores and handle
The associated various information of the operation of device 1913.RF unit 1915 connect with processor 1913 and sends and/or receive radio
Signal.User equipment 1920 includes receiving module 1921, sending module 1922, processor 1923, memory 1924 and radio frequency
(RF) unit 1925.Processor 1923 can be configured as realizing by process proposed by the present invention and/or method.Memory 1924
It connect and stores and the associated various information of the operation of processor 1923 with processor 1923.RF unit 1925 and processor
1923 connect and send and/or receive radio signal.Base station 1910 and/or user equipment 1920 can include individual antenna
Or mutiple antennas.Above-mentioned embodiment corresponds to elements and features of the invention according to the combination of regulation form.Also,
Unless corresponding element or feature are explicitly referred to, otherwise it can be seen that they are selective.Can according to fail and its
Its element or the form of feature combination realize each of element or feature.Moreover, can by partly by element and/or
Feature is combined to realize embodiments of the present invention.It can modify for illustrated by each embodiment of the invention
The sequence of operation.Some configurations of one embodiment or feature can be included in another embodiment or can replace
The corresponding configuration of another embodiment or feature.And, it is clear that it will be appreciated that embodiment will be by that will fail in appended right
There are the claim combinations for the relationship explicitly recorded to configure or can pass through after submitting application together in it is required that
Amendment included as new claim.In the disclosure, the specific operation for being illustrated as being executed by base station is in some cases
It can be executed by the upper node of base station down.Particularly, with include base station multiple network nodes construct network in, show and
It is clear to, the various operations executed to communicate with user equipment can be held by base station or other networks in addition to the base station
Row." base station " can be replaced with the term as fixed station, node B, eNode B (eNB), access point (AP) etc..
Embodiments of the present invention can utilize various mean to realize.For example, embodiments of the present invention can utilize
Hardware, firmware, software and/or any combination thereof are realized.In the embodiment by hardware, each reality according to the present invention
The method for applying mode can be by from including ASIC (specific integrated circuit), DSP (digital signal processor), DSPD (digital signal
Processing apparatus), PLD (programmable logic device), FPGA (field programmable gate array), processor, controller, microcontroller,
At least one that select in the group of microprocessor etc. is realized.
When passing through the embodiment of firmware or software, the method for each embodiment according to the present invention can lead to
Module, process and/or function for executing functions or operations described above are crossed to realize.Software code is stored in storage
In device unit, then it can be driven by processor.
Memory cell is arranged on portion in or beyond processor and is exchanged with the various means for passing through public domain with processor
Data.
The detailed description of the preferred embodiment of the present invention is had been presented for so that those skilled in the art can be realized
And practice the present invention.Although having described the present invention with reference to exemplary embodiments, it will be apparent to those skilled in the art that
In the case where not departing from the spirit or scope of the present invention described in appended claims, the present invention can be made various
Modifications and variations.Therefore, the present invention should be not limited to particular implementation described herein, but should comply with and this paper institute
Principle disclosed and the consistent widest scope of novel feature.
It, can be according to except mode those of described herein in the case where not departing from spirit and necessary characteristic of the invention
Outer other ad hoc fashions execute the present invention.Be discussed in detail above thus will be interpreted in all respects it is illustrative, without
It is restrictive.The scope of the present invention should be determined by the reasonable dismissal to appended claims, and fall into appended power
All changes in meaning and full scope of equivalents that benefit requires will be included therein.It is not explicitly referenced in the following claims
Claim can be presented or after the application is submitted as exemplary embodiments of the present invention in combination
Included as new claim by subsequent correction case.
Industrial feasibility
The present invention is suitable for the wireless communication device of such as UE, relay and eNB.
Claims (10)
1. a kind of reception is by the first user equipment (UE) from base station in the wireless access system for supporting full-duplex radio FDR transmission
The method for receiving signal, this approach includes the following steps：
The first reference signal is received from the base station；
The first channel information about self-interference is calculated using first reference signal；
The second reference signal is received and when receiving second reference signal from the 2nd UE reception the simultaneously from the base station
Three reference signals；
It is calculated based on second reference signal, the third reference signal and first channel information from wherein eliminating
The second channel information of the self-interference；And
It is received using the second channel information and about the third channel information for the channel for having received the signal described
Signal.
2. according to the method described in claim 1, wherein, sending second benchmark from different frequency resources and time resource
Signal and the third reference signal.
3. according to the method described in claim 1, wherein, sending institute from a part for the resource for sending common reference signal CRS
The second reference signal is stated,
Wherein, the third reference signal is sent from remaining resource.
4. according to the method described in claim 1, wherein, being sent from a part for the resource for sending demodulation reference signal DM-RS
Second reference signal,
Wherein, the third reference signal is sent from remaining resource.
5. according to the method described in claim 1, this method is further comprising the steps of：
Receive UE capabilities request message；And
It sends comprising indicating that the FDR transmits the UE capability information message for the field whether being supported.
6. it is a kind of in the wireless access system for supporting full-duplex radio FDR transmission from the user equipment of base station received signal
UE, the UE include：
RF unit；And
Processor, the processor are configured as receiving the first reference signal from the base station, which is configured as utilizing institute
First channel information of the first reference signal calculating about self-interference is stated, which is configured as receiving second from the base station
Reference signal and when receiving second reference signal from the 2nd UE simultaneously receive third reference signal, which is matched
It is set to based on second reference signal, the third reference signal and first channel information and calculates from wherein eliminating
The second channel information of the self-interference, the processor are configured as using the second channel information and about having received
The third channel information of the channel of signal is stated to receive the signal.
7. UE according to claim 6, wherein send the second benchmark letter from different frequency resources and time resource
Number and the third reference signal.
8. UE according to claim 6, wherein described in a part transmission from the resource for sending common reference signal CRS
Second reference signal, and wherein, the third reference signal is sent from remaining resource.
9. UE according to claim 6, wherein send institute from a part for the resource for sending demodulation reference signal DM-RS
The second reference signal is stated, and wherein, sends the third reference signal from remaining resource.
10. UE according to claim 6, wherein the processor is configured to receiving UE capabilities request message and sending out
It send comprising indicating that the FDR transmits the UE capability information message for the field whether being supported.
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| PCT/KR2014/007271 WO2016021750A1 (en) | 2014-08-06 | 2014-08-06 | Method and device for receiving signal in wireless access system supporting fdr transmission |
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| JP6517448B2 (en) * | 2015-10-21 | 2019-05-22 | エルジー エレクトロニクス インコーポレイティド | Method and apparatus for controlling self-interference duplicate signal for self-interference cancellation in an environment supporting FDR scheme |
| US10624108B2 (en) * | 2017-04-05 | 2020-04-14 | Qualcomm Incorporated | Coexistence interference mitigation in wireless systems |
| GB2563412B (en) * | 2017-06-14 | 2020-08-12 | Samsung Electronics Co Ltd | Improvements in and relating to interference reduction in dynamic TDD systems |
| US11115239B2 (en) | 2017-12-01 | 2021-09-07 | Huawei Technologies Co., Ltd. | Preamble structure supporting full duplex communications |
| US11910217B2 (en) * | 2020-05-07 | 2024-02-20 | Qualcomm Incorporated | Demodulation reference signal based self-interference measurement |
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| WO2012153988A2 (en) * | 2011-05-10 | 2012-11-15 | 엘지전자 주식회사 | Method for receiving reference signal and user equipment, and method for transmitting reference signal and base station |
| CN103120010A (en) * | 2010-09-14 | 2013-05-22 | 高通股份有限公司 | Method and apparatus for mitigating relay interference |
| CN103516638A (en) * | 2012-06-25 | 2014-01-15 | 华为技术有限公司 | Method of obtaining channel response of self-interference channel, and full duplexing communication machine |
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| US10284356B2 (en) * | 2011-02-03 | 2019-05-07 | The Board Of Trustees Of The Leland Stanford Junior University | Self-interference cancellation |
| KR101218726B1 (en) | 2011-02-21 | 2013-01-21 | 성균관대학교산학협력단 | Method for receiving synchronization signal using partial full duplex relay scheme |
| US8954024B2 (en) | 2011-03-31 | 2015-02-10 | Chien-Cheng Tung | Full duplex wireless method and apparatus |
| US9686000B2 (en) * | 2011-04-15 | 2017-06-20 | Futurewei Technologies, Inc. | System and method for two-way relaying with beamforming |
| US9277398B2 (en) * | 2011-08-22 | 2016-03-01 | Sharp Kabushiki Kaisha | User equipment capability signaling |
| US9019849B2 (en) * | 2011-11-07 | 2015-04-28 | Telefonaktiebolaget L M Ericsson (Publ) | Dynamic space division duplex (SDD) wireless communications with multiple antennas using self-interference cancellation |
| US8576752B2 (en) * | 2011-12-14 | 2013-11-05 | Redline Communications, Inc. | Single channel full duplex wireless communication |
| EP3309972B1 (en) * | 2012-05-13 | 2019-07-10 | Amir Khandani | Full duplex wireless transmission with self-interference cancellation |
| KR20140067780A (en) * | 2012-11-27 | 2014-06-05 | 삼성전자주식회사 | Method and apparatus for interference cancellation of mimo transmission in wireless communication system |
| US9419777B2 (en) * | 2013-07-15 | 2016-08-16 | Zte Corporation | Full duplex operation in a wireless network |
| WO2018091081A1 (en) * | 2016-11-16 | 2018-05-24 | Telefonaktiebolaget Lm Ericsson (Publ) | Listen before talk for reference signals in mimo systems |
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| CN103120010A (en) * | 2010-09-14 | 2013-05-22 | 高通股份有限公司 | Method and apparatus for mitigating relay interference |
| WO2012153988A2 (en) * | 2011-05-10 | 2012-11-15 | 엘지전자 주식회사 | Method for receiving reference signal and user equipment, and method for transmitting reference signal and base station |
| CN103516638A (en) * | 2012-06-25 | 2014-01-15 | 华为技术有限公司 | Method of obtaining channel response of self-interference channel, and full duplexing communication machine |
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